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dohc

  1. EMM

    Suspension advice for Scrambler build

    I’m building my 1979 CB750L into a scrambler. This is my first bike and have been doing mounds and mounds of research learning as much as I can and planning a roadmap for the build. But by far, the most dizzying aspect of the build has been figuring out what to do for suspension. I want to to...
  2. J

    Starter clutch oil seal on a 1979cb750f Supersport dohc

    Where does it go please help ?
  3. H

    Candy Muse Red

    Hi all, I am new to this forum. I have just bought a 1980 model (manufactured in July 1979 from the vin plate) and I want to have it painted in Candy Muse Red. Does anyone know of a close match in modern day colours.? Thanks
  4. B

    1982 CB750 F fork tube mystery

    Hey all. I am working on putting my 750 back in use after being dormant for a while. Besides all other stuff you all are aware of I am trying to get new TNK fork tubes for the the bike since original ones have some pitting, not terrible but why not replace them if /while they are available. Well...
  5. Bmb2492

    Painting the tank to match

    I have a 82 honda cb 750 nighthawk. The metallic blue is a nice color. I have a new tank and want it to match. Where can I get paint to match so I don't end up with a black tank. Could I use the paint code? I wouldn't know where to find it.
  6. Bmb2492

    Fuses popping at solenoid

    82 cb750sc Nighthawk.. I was trying to get my tail lights working and saw smoking after replacing the old round fuses. Now every time I try to hook up the battery, the fuse blows at the solenoid. All I have done is put new fuses in the fuse box and put a brake master cylinder on it. Maybe I have...
  7. Bmb2492

    '82 750 nighthawk suspension questions???

    So I have a nighthawk and see very little on here about these. It has sit for 29 years and I got it running. But I'm looking for rear shocks and maybe a different front suspension. Does anyone know the rear shock specs and will parts interchange between this model and the s/f/k bikes?
  8. Bmb2492

    750 Nighthawk Gas tank

    I have a '82 750 nighthawk The gas tank was rusted and the previous owner tried to line it and it didn't go well. I tried to get it sandblasted and it exposed a ton of pinholes. Where could I find a tank? I haven't found any online. I'm pretty sure nothing will interchange. How would I even go...
  9. D

    CB900C or CB750C gas tank

    I'm looking for a gas tank for a CB900C or CB750C, preferrably red but will buy any color. Prefer no dents or small ones at most.
  10. P

    1982 CB750(C/F/K) Swing Arm Dimensions

    Hi all, I'm looking for the dimensions of the rear wheel and swing arm from a 1982 Honda CB750F. I want to compare the differences of the 750 rear wheel and swing arm dimensions with the rear wheel and swing arm from my '82 CB650SC as I'd like to see if they can be used to perform a rear disc...
  11. NoIdeaWhatImDoing

    Plug Fowling and Other Photos

    Evening Friends, Ill state briefly that the current issue im having is cranking not starting. Last time it ran was about 2 months ago....Bike has been sitting with gas in carbs since then... In my mission to get this bike starting reliably and running, I've been chasing my tail. Moments...
  12. NoIdeaWhatImDoing

    '82 CB750 Side Fairings / Repair / Fabrication / Fitment

    Afternoon Friends, I've been stalking around the threads for similar info. I am mid restoration on an 82 CB750SC NH. Basically everything visible needs a facelift. I do not have the side covers/fairings. My questions are; -Will a side fairing of the same year, but from a CB650 fit on the...
  13. NoIdeaWhatImDoing

    '82 CB750SC / Difficult Starting & rough idle

    Hello All, ...Its important to state for the record that i am not an experienced motorcycle mechanic... 82 cb750SC NH. Got the bike free from a friend. It sat in his garage for a year-ish. He cleaned up the carbs but didn't rebuild them. When I hauled it to my house, it wasn't running, carbs...
  14. W

    Exhaust specifications

    Does anyone have any good resources for information on the original exhaust for the '79-'83 CB750K? I'm specifically interested in the 1980 bike info. I'm seeing exhaust that are labeled, Sankei 2043, Sankei 2075. And it looks like HM425A is the correct fit. I don't want to accidentally buy an...
  15. Bmb2492

    750 Nighthawk

    I bought an 82 cb750 nighthawk with 4,487 miles on it for $300. Hadn't been tagged since 03 so probably never had ethanol ran through it. Replaced the battery and spark plugs and it tries to idle with the choke on. Should I rebuild the carbs or just clean them? Any ideas that might help. I'm...
  16. Butscut

    Neutral switch not grounding to shift drum

    Hey folks, I've got a problem. After double checking all my wiring and being 110% it's all correctly connected, I think I have worked out why my neutral switch is not triggering the neutral light. As I understand it, when the end of the switch connects to the shift drum (when placed in the...
  17. Luis Etchenique

    Steering Stoppers

    For my current build ( ‘79 Super Sport resto-mod ), I would like to limit the steering turning by about 1/2” on each side — this to allow enough clearance between controls mounted on the clip-on bars, and the gas tank, and prevent contact. Any suggestions out there ? Has anyone done or tried...
  18. loxley007

    Is it the same engine?

    Hi all, can anyone tell me whether a 1980 CB750KZ DOHC (UK version) RC01 engine is the same as the 750K (North American version) RC01 engine? I’m looking to potentially take parts from one to another. Thanks.
  19. S

    Uni NU-4046 In Stock Airbox -- Any Jet Changes Needed?

    Hey folks, got a question regarding a stock replacement oiled foam filter: the UNI NU-4046. Couldn't find any threads on it in this forum. This is for a buddy's 1980 CB750F, which has already been rendered not-original by multiple previous owners. It currently has a set of horrible cheap pod...
  20. Butscut

    Oil pump priming.... Is it needed?

    Hey folks. I have just rebuilt the top end of my 1982 CB750F supersport engine which included engine removal, flipping it over to remove the oil pan and reassembly. Although I didn't rebuild the oil pump when I flipped the engine some oil came out in the vicinity of the oil pump so I fear that...
  21. G

    Charging

    Morning All, and Happy New Year. Please could I get help with worst possible problem (for me anyhow). I can ride my 1980 750 Custom sometimes, and everything is good. Battery spins the starter like crazy, and bike starts. Other times the battery is basically completely dead, and I have to push...
  22. loxley007

    Exhaust port - cleaning

    Hi all, I’m looking for advice on the best method of cleaning the inside of my exhaust port. They look pretty filthy/corroded. I’ve attached two photos for info. Any advice?
  23. Luis Etchenique

    frame-mounted OKI Spark Units and Rectifier

    Now in the process of re-assembling my electrical, I have relocated some of the items: The two OKI spark units and the rectifier. Question: Do these units need to be insulated, or can I mount directly on the frame without insulation ? I am not sure if they use the frame's ground polarity to...
  24. Snottyvar

    Wheel bearings

    Restoring a 1977 CB750K on a budget. Wheel bearings are running $30-$50 on line (6304LU bearing) but I can get the 6304 2RS at Princess Auto for $7, same dimensions, 2RS indicating they are sealed on both sides. Is anyone using these bearings? They sure look and feel good
  25. P

    Position of High Point of VALVE LOBE when using feeler Gauge

    I have just bought a 1981 CB750FZ. I have just checked the Valve Clearances and they are all to tight Exhaust 004 004 003 003 003 003 004 003 Intake 003 002 002 003 004 002 004 003 Just asking where about does the high part of the Cam Lobe point to get the correct reading ??? I...
  26. Nicklynn1

    Looking For 1979 CB750 LTD Muffler and Chain Warning and Read Fender Warning Stickers

    I am looking for the frame warning stickers and rear fender sticker. Does anyone know where to get them? I have looked all over and have not found any OEM or reproduction. Right side muffler caution sticker: product number: 87504425670 Left side chain caution sticker: product number...
  27. Butscut

    CB750F 1982 Carb spacing / Inlet boot issue

    Hi folks, I'm currently restoring a 1982 CB750F Supersport and having now rebuilt the engine I am test fitting a new set of Mikuni carbs and found and have run into an issue. From memory the carb spacing of the OEM KeiHin carbs (now sold) was 80-100-80 at the inlet of the rubber boots. As these...
  28. Butscut

    Wiring to Pulse Generator

    Hey Folks - Random question, I have an '82 CB750F Supersport. There are two blue and two yellow wires connecting the spark units to the pulse generator. Qn - does it matter which way round they connect, is this important? I understand that the two yellows feed one spark unit and the blues the...
  29. Luis Etchenique

    Fuse Box - '79 CB750F S/S

    In converting this bike into a race-replica, I had to reconfigure the electrical harness, build a junction box under the seat, shorten some of the control wires ... and now I am confronted with the fuse box. I have deleted the turn signals, and I have built a new dashboard which includes the...
  30. C

    Frame geometry

    I have a 1980 CB750C 32,000 miles on the spedo. I Purchased the bike used several years ago and finally got it running last year. The motor runs good. The bike was then parked for several years prior to me purchasing it. The seller did not know the history of the bike since it was driven by a...
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